HA-2425 데이터 시트보기 (PDF) - Harris Semiconductor
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HA-2425 Datasheet PDF : 9 Pages
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HA-2420, HA-2425
Test Circuits and Waveforms (Continued)
S/H
CONTROL
OUTPUT
HOLD
SAMPLE
∆V
SINE WAVE
INPUT
IN2
IN1
IN3
IN4
IN5
IN6
IN7
IN8
A2
A1
+5V
EN
HI-508A
MUX
OUT
A0
-IN HA-2420/2425
VO
OUT
+IN S/H
HOLD
CONTROL CAP GND
VINP-P
CH
∆t
NOTE: Measure the slope of the output during hold, ∆V/∆t,
and compute drift current from: ID = CH ∆V/∆t.
FIGURE 3. DRIFT CURRENT TEST
Schematic Diagram
S/H CONTROL INPUT
NOTE: Compute hold mode feedthrough attenuation from the formula:
Feedthrough Attenuation = 20log V---V-O----I-U-N---T-H---H--O---O--L---LD----D---
Where VOUTHOLD = Peak-to-Peak value of output
sinewave during the hold mode.
FIGURE 4. HOLD MODE FEEDTHROUGH ATTENUATION
OFFSET ADJ.
V+
Q5
Q17
Q106
Q82
Q89
Q90
Q2
RP
Q7
Q9
Q91
Q105
Q15
Q11
D1
Q8
Q
Q21
19
Q3
Q10
S/H
CONTROL
GND
Q12
Q18
Q13
Q22
Q83
Q14
R11
Q103
Q16
Q23
Q4
R1
R2
Q29
Q30
Q58 J63
Q64
Q65
Q66
Q72
Q45
Q46 Q59
Q74
J61
Q73
Q87
Q51
Q52
Q6
Q20
Q24
Q25
Q26
Q47
Q48
R7
Q53
Q49
Q54
Q27
Q50
Q31
Q32
Q33 Q34
Q38
Q35
Q100
Q101
Q56
Q55
C4
J60
R121
CH
Q75
C3
15pF
R8
Q76
Q67 Q69
Q68
R9
OUT
R10
Q77
Q39
Q40
Q83
Q41
GND
J86
J57
Q78
Q70 Q79
Q42
Q43
Q44
R13
+IN
-IN
Q102
Q62 Q71
Q80
R14
Q81
V-
5-6
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